Having purged over 1Gb of Temp Files after writing my last blog post about iTunes using lots of disk space, 5 days later I was back up to 1Gb again.
This time I noticed that the Temp Files were all timed at either 2 or 3 minutes past the hour, which made me suspect something specific was triggering the new file creation. I checked my PodCast update schedule, and found it was set to run hourly, at 2 minutes past the hour. Coincidence? I think not.
I set PodCast updates to be daily, and the Temp File creation has become more of a daily occurrence. Still annoying, but at least I won't have to purge the files so often.
